Impact of congestion on fuel price
Ranking: Cities with highest cost of driving at rush hours
Average annual fuel cost spent for a 6-mile daily round trip driven at morning & evening peak hours (total 12 mi/day), in minutes/seconds.
| City center (3mi radius) | Petrol car | Diesel car | |||||
| Annual fuel cost | Due to traffic | Annual fuel cost | Due to traffic | ||||
| Hong-Kong | $1 033 | $187 | $776 | $125 | |||
| Paris | $970 | $299 | $832 | $238 | |||
| London | $921 | $235 | $814 | $198 | |||
| Zurich | $836 | $162 | $799 | $139 | |||
| Athens | $834 | $229 | $639 | $159 | |||
In Hong Kong, where the petrol price is particularly high, a 6-mile round trip driven every day with a typical petrol-powered car cost a commuter US$ 1,033 in 2023; but in Paris, traffic has had a very significant impact on a daily commuter's budget, with traffic jams "costing" them almost US$ 300 in 2023, i.e. a 45% increase in the fuel budget if these trips had been made under optimal conditions.
Impact of congestion on CO2 emissions
Ranking: Cities with the highest CO2 emissions per car at rush hour
Average annual CO2 emissions based on a 6-mile daily round trip driven at morning & evening peak hours (total 12 mi/day), in kg of CO2.
| City center (3mi radius) | Petrol car | Diesel car | ||
| Annual CO² emitted | Due to traffic | Annual CO² emitted | Due to traffic | |
| London | 1116 kg | 285 kg | 1048 kg | 255 kg |
| Paris | 1077 kg | 332 kg | 1039 kg | 297 kg |
| Manila | 1017 kg | 285 kg | 965 kg | 251 kg |
| Bucharest | 1010 kg | 298 kg | 956 kg | 255 kg |
| Ankara | 1000 kg | 197 kg | 1024 kg | 157 kg |
